People who like good ergonomics and don't want to chimp every couple of shots to drill down through a convoluted menu to change settings

People who buy proper field monitors

There are plenty of reasons to avoid the articulated screens. Likewise, some people shun wireless networking for various reasons - some for cuckoo reasons like "radiation is bad for you" (um, only if it's ionizing radiation - which wifi is not), some for security, and some because it's just another thing to break.

And SD cards was actually one of the reasons I wanted to switch to a 70D.

I would trade all those parts on the 7D for the rotating screen and wifi any day. Total game changers.